Hendrik Koster

As part of my interest to be able to more accurately monitoring my AMG GT engine oil level and related oil temperature control I got a spare oil reservoir.
I hereby share some of my findings after I made some observations and taken some pictures using the spare reservoir.
I'm inviting comments from others that may find this information useful to them.
I understand/see that pulling the drain plug with the engine oil at the normal working temperature and the in tank oil level at its highest will create a siphon effect in feed and oil return line.

Surge

Interesting. Are you saying you added a 3rd-party secondary oil tank?

On a somewhat related note: is there an automatic oil overfill message that comes up, or do you have to check the level to see if it’s overfilled?

Hendrik Koster

No, I got the extra/spare oil tank just to run some in house experiments - things I consider doing are:

1. I may look into a substitute (besides the original one) oil dip stick that can be used to check the oil level when the engine is cold
2. An alternate to the factory hot oil drain method, I'll get back here after I have had the time to do some of these experiments.

When your oil reservoir gets overfilled (for what ever reason) you do get an automatic message in your instrument cluster.

Best H

Stenzel-Germany

Hi Hendrik,

I like your reports. Always interesting. Outside the box. Thank you.

Do you mean checking the oil level when it is cold? Then you just have to subtract the heat expansion of the oil.
In any case, you have to let the engine run for about 1 minute. There will always be oil running back into the engine.
How much this is depends on the duration of the standstill. The non-return valve is not a 100% leakproof component.

Maybee I misunderstood something?

Kind regards

Stenzel

Hendrik Koster

Hi Stenzel,

Thanks you, your one of the participants here that always has great input/feedback and I appreciate that. Yes the factor of the oil heat expansion (depending on temperature and time) are there, are you saying that if the car sits overnight all the oil out of the reservoir runs back into the engine? I'm planning to check this with an alternate dip stick that will go down to the very bottom of the tank.
When you say the non-return valve do you mean to say it's a one way valve?

Again thanks for your input, much appreciated.

Best H

Hendrik Koster

Cold level checked see pictures

Stenzel-Germany

Hi Hendrik,

That's exactly what I mean.Every dry sump lubrication normally has a one way valve in the inlet of the oil pump.This is near the oiltank lowest point, and the oil tank is usually higher up.Otherwise the oil would flow back into the engine.It can be tight, it should, but it is not always.

When I want to check the oil level, I don't know it. Therefore, let it run for a moment, then everything is where it should be.

The return pump, (Often there are several, that suck off at different points), usually have at least 2 - 4 times as much throughput as the feed pump.
A short engine run is completely sufficient.

Suggestion: Drive until your oil has reached temperature (here is 100 degrees Celsius), possibly fill up to the maximum. Next day., cold oil, short engine run, check. Due to the expansion, you must now deeper on level. Remember this fill level, and you have your future cold oil level control.

Kind Regards

Stenzel

Acta_Non_Verba

Stenzel - This is interesting information. I will try this.

Best,

Hendrik Koster

1. I use aluminium tube as it easier to ruff up the surface area and it gives a color contrast against the color of the oil.
2. Apply some abrasion with a file to the tube in order to make the chalk stick.
3. Apply chalk to the abraded area of the tune.
4. After stick is dipped in the oil reservoir the oil level will show a distinct line against the chalk on the tube.
5. Detail view of the line.

I also use the chalk on the red part of the MB original dip stick in order to better/easier see the exact line of the oil level on it.